Drum-brake



w s, HUTCH-INSON.

I DRUM BRAKE.

APPLICATION FILED JAN. 31. 1917,.

- Patented. July 22, 1919 4 SHEETS-SHEET lawuemfoz I anon wag,

"w. s. HUTCHINSON.

DRUM BRAKE. A'PP-LICATION FILED mma n-wn.

Patented July122, 1919.

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-%1Q GUM/14241, I II."

-W. S. HUTCH INSON.

' DRUM BRAKE.

APPLICATION FILED "JAN. 31. 1917.

4 SHEETS-SHEET s.

i I. Patenteti July 22, 1919.

WILLIAM SANFORD HUTCHINSON, OF. OYSTER BAY, NEW YORK.

DRUM-BRAKE.

Specification of Letters Patent.

' To all whom it may concern Be it known that I, "WILLIAM S. HUTCHIN-soN, a citizen of the United States, and a' resident of Oyster Bay,Nassau county, New York, have invented a new and useful Improvement inDrum-Brakes, of which the I automobiles, although the invention can befollowing is a full, elear,-and exact description. My invention relatesto improvements in drum brakes such. as are generally used on applied toany brake whichis used on'the inner side of a .rotary drum to check orstop the drum from rotation. The object of my invention is to produce asimple and powerful brake of this character which will operate Withoutreference to the direction of the rotation of the drum, and moreespecially to provide a simple; strong and efiicient means by which allparts of the shoe will he brought simultaneously to bear' on the innersurface of the-drum. The invention is especially applicable to the typeof brake in which a band is dragged'endwise by the frictional contactbetween the band and the brake drum, and I utilize the drag of the brakeshoe to actuate the parts which move all portions of the shoe intosimultaneous and firm contact With the drum. practical experiments onautomobiles I have found that where brakes of thischaracter are'appliedto. the inner" side of the 'drum' and allowed to come into frictionalcontact gradually along their length, that is to say where there is adrag ing action and the brake shoe takes hold rst at one end, the

parts-wear unevenly, and after atime'this unevenness .is accentuated sothat the brake shoe does not operate so quickly and. with suchreliabilityas is desirable. In this style Y of brake, the settingmechanism'simply provides for throwing the shoe into contact with thebrake drum, and then the movement of the drum causes the shoe, by reasonof certain mechanism which is not here necessary 'to define, to comeintoforcible contact with the drum and so stop or check the latter.

Patented July 22, rain.

Application filed January 581.1917. Serial No. 145.573.

In my present invention I connect all the equally. This will be clearlyunderstood from the description which follows.

Reference is to be had to the accompany ing drawings forming a part ofthis specification, in which similar reference characters indicatecorresponding parts in all the views. Figure 1 is a broken sectionalelevation of my improved brake mechanism taken on the line 1*1 ofFig.=2. I

Fig. 2 is a broken section on the line 2-2 of Fig. 1.

Fig. 3 is 'a detail elevation of the support and guide for the shoe.

Fig, 4 is a side elevation of the connector for connecting the severalshoe pressure devices. l

' Fig. 5 is a cross section on the line 5-5 of Fig. 6 f one of thepressure rollers.

Fig. 6 is a side elevation of one of the said rollers.

Fig. 7 is a cross section on the line 7.'?

of Fig. 6. v Fig. 8 is a detail section of a part of the shoe showingits relation to its support.

Fig. 9 is a detail View at right angles to that shown in Fig. 8,bringing out in elevation the relation of a shoe,its support, and themeans for forcing the shoe against the drum. Fig. 10 is a detail crosssection through the shoe and part of its support.

Fig. 11 is a broken detail side elevation of a part of theshoe. 1

Fig. '12 is across section on the line l212 of Fig. 11.

Fig. 13 is a broken side elevation of a vpart of the shoe support.

i Fig. 15 isa brokenside elevation of a portion of a connector and itsmeans of connection with the shoe.

Fig. 16 is a cross sectionon the line 16-16 of Fig. 15. a

Fi 17 is a broken detail side elevation of at: adjustable block for thepressure de vices or rollers.

Fig, 18 is a cross section on the line 18 of Fig. 17. j 3 4 v Fig. 19 isa plan or face viewdf the struc; ture shown in Fig. 17.

Fig. 20 is a detail side elevation showinga means by which as the brakeshoe becomes worn, the lost motion can be taken up.

Fig. 21 is a detail cross section of the structure shownin Fig. 20.

Fig.22 isa broken detailside' elevation of a preferred means of unitingthe two members of the connector, and

Fig. 23 is a cross section on the line 23-23 of Fig. 22.

The drum 10 as'shown is the ordinary brake drum of a car,-but as abovestated it can be anyrotatable drum to which it is desired to afiix orconnect a brake. As illustrated the drum connects with the hub of one ofthe wheels, and opposite one side of the drum is a plate'or support 11which is fast to the hollowv axle 12, all the above being purcly'conventional. Within the drum is a support or bracket 13 which may becarried in a stationary manner inany suitable way, but which is shownsupported by bolts 15 which pass through the plate or bracket 11, andthrough holes 16 in the member 13. The member 13 is preferably providedwith a transverse strengthening rib 14, and is cut away for a segment asshown at 14 to provide for the brake setting mechanism. At intervals theouter web of the member 13 is notched as shown at 17 to provide opp'ositely inclined walls 18 on which moves the roller or pressure member 19which serves to force the shoe 24 against the drum 10. This roller 19turns on a shaft flattened at 20, these parts lying in the sockets 21 inthe connector 22, thus preventing the shaft from turning, while theouter ends of the shaft cari y rollers 23 which bear against the shoe24. It will be seen that when the drum is moving and the shoe 24 isbrought into contact with the drum,.the shoe will move endwise and byreason of its connection with the roller 19 which will be more fullydescribed. presently, the said roller-and the several similar rollersconnected therewith will roll upon the inclines 18 and the roll ers 23will force the shoe into firm contact with the drum.

The outer portions of the pressure devices are preferably covered bycaps 25 as shown in: Fig. 1, these caps b6111 secured to the oppositemembers 22 whic form the conthe rollers 19 run can be adjustable so-asto compensate for wear of the brake shoe and nector. If desired thetracks 18 upon-which 6 drum, as shown in Figs. 17 to 19. Here the tracksare formedon adjustable blocks 36 which have ribs 37 radially arrangedand movable in corresponding ways in the stationary support 13, and theblocks 36 are each backed by screws .38 which screw through an adjacentpart of the support 13, and thus by adjusting the screws the blocks 36,the tracks 18, and the pressure devices carried thereby can be moved inor outwith reference to the drum and shoe. Any.con-. 1 venient-means canbe used forpreventing thescrews from unscrewing, as for instance byrunnin pins 39 through slots 40 in the screws and corresponding holes inthe memthe rollers are arranged between the shoe 24 r and the stationarypart'13 behind it. The screw shafts 42 have squared ends 43, and aresecured by lock nuts44. It will be seen that by loosening the nuts andturning the shafts, the eccentric 41 may be adjusted so as to hold theshoe 24 the desired distance from the drum 10, when the shoe is inreleased position.

The connector uniting the pressure mem bers 19 is preferably formed oftwo similar rings 22, and. these are firmly united together as shown inFigs. 15 and 16.- Obviously a single member connector could be I used,or the parts may be connected in dif ferent ways without affecting theinvention, as I claim any connection between the members 19 which shall,cause'them to all move in unison. As shown however, a spacer 27 isplaced between the members 22 at some part of their length, and parts 28corresponding in size to the spacer 27 are placed on the outside of themembers 22,.while rivets 29 or similar fastenings firmly secure all theparts together. 7 This coupling of the members .22 rides in the space 30(see Fig. 13) which is cut out of the outer portion or web of the member13,

and suflicient space is left to permit of the necessary movement of thecoupling parts 27 and 28. These coupling members have projections 31which fit in the space 32 (see Fig. 11) between the brackets 33 of theshoe 24. Thus when the shoe is moved lengthwise it will act on theprojections or teeth 31 of the coupling and move the connector 22 andthe rollers 19, causing these to simultaneously roll upon their inclines18, while I all the rollers 23 of. the several pressure devices willimpinge at onetime upon-the shoe 24 and force'the latter into firmcontact with the drum 10. A preferred means of uniting the two members22 of the connector is shown in Fi 22'and 23, i1 which a block .45 isprovide with a tooth.,; to fit between the brackets 33, and the block isrecessed as shown'at 47? soas to fit firmly over the two members 22, theseveral parts.

being united by rivets 48 or equivalent fastemng.

It will be obvious that other means can'besubstituted for connectingthe-coupling with the shoe, and the connector with the pressure devices,without affecting the invention, and I do notlimit my invention to themeans shown, although this is well suited for the purpose. .To bring thepressure devices to normal position and also to bring the shoe out ofnormal position, that is tosay out of contact with the drum, I employ.springs 34 which aref-astened to the sides of the bracket 1'3.and whichconnect with pins 35 on the connector 22. These springs have oppos tetensionso as to movethe shoe back Without reference to which directionit has been previou'sly moved.

' To set the shoe in operation, that is to bring it into frictionalcontact with the drum, I have shown conventional mechanism whlch 1s lo--cated in the space-1ft at the ends of the bracket '13. This mechanismcomprises a crank 37 andlinks 38 and 39 connecting the crank with theshoe 24. It {will be observed that not much power is required in thismechanism, as when the shoe is once in frictional contact with the drumthe latter Wlll byits movement move the shoe along as already.described,so that the pressure devices 19 and 23will'force the shoe1nto firm contact with the drum.

It will be seen that the structure which I have described is applicableto any internal strap brake or similar brake in which the drag of thebrake shoe actuates pressure devices to force the shoe into firm contactwith the drum, and the structure which I have described while serving.primarily as a brake,

would also be adapted for use as a clutch in certain forms of'maclnnery,without changing the mechanism to any extent.

. 19 with larger contact rollers.

-Attention is called to the fact that when the shoe wears, adjustmentcan also be obtained by providing the shafts of the rollers I claim 1.The combination with the drum and the internal stationary support, of ashoe between the support and the flange of the drum, a plurality ofpressure devices carried by the support behind the drum and adapted toforce the shoe against the drum flange, and a connector connecting theseveral pressure devices whereby the moveously transmitted to theothers.

- 2. A structure-ofthekind described comment of one pressure device issimultaneprisinga' rotary drum, a shoe within the drum having a limitedmovement or drag with the drum when in frictional contact therewith,means for bringing the shoe and drum into frictional engagement,pressure devicesspaced apart'behind the shoe, an operative connectionbetween the several pressure devices whereby the movement of one istransmitted to theothers sothat allv will actin unison, and an operativefrictional connection between the pressure devlces and the shoe wherebythe movement of the shoe with thedrum will actuate the pressure devices.

3. A, brake of the character described comprising a rotatable drum, ashoe within and concentric with the drum flange, said shoenio'Yingendwise when in frictional contact with the drum, means for moving theshoe into frictional engagement with the drum, independent pressuredevices spaced apart within the drum behind the shoe and adapted whenthe shoe is moved endwise to "force it firmly against the drum flange,and a rigid connection between the several pressure devices whereby the.ntward movement of one is instantly andi simultaneously' communicated tothe others.

brake of the kind described comprising a rotatable member, a shoearranged concentrically with and in close proximity,

whereby all will. move in unison.

5. A brake of the kind described comprising arotatable member, ashoe'arranged within and in close proximity to the mem her, said shoehaving an endwisel movement when in frictional engagement with saidrotatable member, means for moving the shoejnto frictional contact withthe memher, a support having. inclined walls, said walls being arrangedat intervals behind the shoe, rollers adapted to run on said inclinedwalls and force the shoe against the rotatable member when the shoe ismoved endwise, shafts extending through the several rollers and on whichthe rollers run, and a connector supporting the several shafts wherebythe bodily movement of one shaft will be transmitted to the severalshafts.

6. In a brake of the kind described the combination with the drum andthe shoe behind and in proximity thereto adaptetl. to movelongitudinally when in contact with the drum, of a stationary supportbehind the shoe, blocks movable in and ont on the support and providedwith oppositely inclined walls on the sides next the shoe, rollersarranged to run on the blocks and E" MORGAN GRIFFIN, E. W. GRIFFIN.

